40279261 has 32 divisors (see below), whose sum is σ = 48254976. Its totient is φ = 33264000.

The previous prime is 40279249. The next prime is 40279271. The reversal of 40279261 is 16297204.

40279261 = 44² + 45² + ... + 494².

It is not a de Polignac number, because 40279261 - 2⁵ = 40279229 is a prime.

It is a super-2 number, since 2×40279261² = 3244837733412242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40279271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 601150 + ... + 601216.

It is an arithmetic number, because the mean of its divisors is an integer number (1507968).

Almost surely, 2^40279261 is an apocalyptic number.

40279261 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

40279261 is a deficient number, since it is larger than the sum of its proper divisors (7975715).

40279261 is a wasteful number, since it uses less digits than its factorization.

40279261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 40279261 is about 6346.5944411156. The cubic root of 40279261 is about 342.7892269824.

The spelling of 40279261 in words is "forty million, two hundred seventy-nine thousand, two hundred sixty-one".